NASA Technical Reports Server (NTRS) 20150003844: Development of Flight Slit-Jaw Optics for Chromospheric Lyman-Alpha SpectroPolarimeter
Publication date 2015-01-06
Topics NASA Technical Reports Server (NTRS), SLITS, CHROMOSPHERE, LYMAN ALPHA RADIATION, SPECTROMETERS, POLARIMETERS, SOUNDING ROCKETS, VIGNETTING, ALIGNMENT, MIRRORS, PERFORMANCE TESTS, TELESCOPES, OPTICAL FILTERS, Kubo, Masahito, Suematsu, Yoshinori, Kano, Ryohei, Bando, Takamasa, Hara, Hirohisa, Narukage, Noriyuki, Katsukawa, Yukio, Ishikawa, Ryoko, Ishikawa, Shin-nosuke, Kobiki, Toshihiko, Tsuneta, Saku, Kobayashi, Ken, Winebarger, Amy, Takeyama, Norihide, Kanai, Yoshikazu, Sakakibara, Yoshiko,
In sounding rocket experiment CLASP, I have placed a slit a mirror-finished around the focal point of the telescope. The light reflected by the mirror surface surrounding the slit is then imaged in Slit-jaw optical system, to obtain the alpha-ray Lyman secondary image. This image, not only to use the real-time image in rocket flight rocket oriented direction selection, and also used as a scientific data showing the spatial structure of the Lyman alpha emission line intensity distribution and solar chromosphere around the observation area of the polarimetric spectroscope. Slit-jaw optical system is a two off-axis mirror unit part including a parabolic mirror and folding mirror, Lyman alpha transmission filter, the optical system magnification 1x consisting camera. The camera is supplied from the United States, and the other was carried out fabrication and testing in all the Japanese side. Slit-jaw optical system, it is difficult to access the structure, it is necessary to install the low place clearance. Therefore, influence the optical performance, the fine adjustment is necessary optical elements are collectively in the form of the mirror unit. On the other hand, due to the alignment of the solar sensor in the US launch site, must be removed once the Lyman alpha transmission filter holder including a filter has a different part from the mirror unit. In order to make the structure simple, stray light measures Aru to concentrate around Lyman alpha transmission filter. To overcome the difficulties of performing optical alignment in Lyman alpha wavelength absorbed by the atmosphere, it was planned following four steps in order to reduce standing time alignment me. 1: is measured in advance refractive index at Lyman alpha wavelength of Lyman alpha transmission filter (121.567nm), to prepare a visible light Firuwo having the same optical path length in the visible light (630nm). 2: The mirror structure CLASP before mounting unit standing, dummy slit and camera standing prescribed position in leading frame is, to complete the internal alignment adjustment. 3: CLASP structure F mirror unit and by attaching the visible light filter, as will plague the focus is carried out in standing position adjustment visible flight products camera. 4: Replace the Lyman alpha transmission filter, it is confirmed by Lyman alpha wavelength (under vacuum) the requested optical performance have come. Currently, up to 3 of the steps completed, it was confirmed in the visible light optical performance that satisfies the required value sufficiently extended. Also, put in Slit-jaw optical system the sunlight through the telescope of CLASP, it is also confirmed that and that stray light rejection no vignetting is in the field of view meets request standing.
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